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Merge pull request #2569 from blattms/prevent-cmake-error-for-cuda-g++-master

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Prevent Cmake error for CUDA with incompatible c++ compiler.
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Markus Blatt 2020-05-05 13:32:10 +02:00 committed by GitHub
commit c6fe4c7bab
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1 changed files with 24 additions and 13 deletions
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37
CMakeLists.txt
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@ -84,7 +84,7 @@ include ("${project}-prereqs")
# Make sure we are using the same compiler underneath
# NVCC as for the rest. In the case that NVCC does not support
# that compiler it will error out. Unfortunately this will only
# work CMake >= 3.8. We found no way to make FindCUDA.cmake error
# work for CMake >= 3.8. We found no way to make FindCUDA.cmake error
# out. It seems to ignore CMAKE_NVCC_FLAGS and CMAKE. Additionally
# our way of specifying cuda source files never worked for CMake
# version < 3.8. Hence we deactivate cuda for these versions.
@ -93,24 +93,35 @@ include ("${project}-prereqs")
# compatibility to cmake 3.6 and lower.
if(NOT CMAKE_DISABLE_FIND_PACKAGE_CUDA AND
CMAKE_VERSION VERSION_GREATER 3.7.9)
if(NOT DEFINED ENV{CUDAHOSTCXX} AND
(NOT CMAKE_CUDA_FLAGS OR NOT CMAKE_CUDA_FLAGS MATCHES ".*-ccbin .*"))
set(CMAKE_CUDA_FLAGS "-ccbin ${CMAKE_CXX_COMPILER} ${CMAKE_CUDA_FLAGS}")
if(CMAKE_BUILD_TYPE)
set(_flags_suffix "_${CMAKE_BUILD_TYPE}")
endif()
if(NOT DEFINED ENV{CUDAHOSTCXX} AND NOT DEFINED CMAKE_CUDA_HOST_COMPILER AND
(NOT CMAKE_CUDA_FLAGS${_flags_suffix} OR NOT CMAKE_CUDA_FLAGS${_flags_suffix} MATCHES ".*-ccbin .*"))
message(STATUS "Setting CUDA host compiler CMAKE_CUDA_HOST_COMPILER to ${CMAKE_CXX_COMPILER} to "
"prevent incompatibilities. Note that this might report that there "
"is not CUDA compiler if your system's CUDA compiler does not support "
"${CMAKE_CXX_COMPILER}.")
# check_language does not seem to care about ${CMAKE_CUDA_FLAGS} or $(CUDA_NVCC_FLAGS}.
# Hence we set CMAKE_CUDA_HOST_COMPILER to our C++ compiler.
# In check_language(CUDA) we will get an error if we in addition put
# "-ccbin ${CMAKE_CXX_COMPILER}" into CMAKE_CUDA_FLAGS. It results
# in "${NVCC} -ccbin=${CMAKE_CXX_COMPILER} -ccbin ${CMAKE_CXX_COMPILER}"
# which causes nvcc to abort
set(CMAKE_CUDA_HOST_COMPILER ${CMAKE_CXX_COMPILER})
set(ENV{CUDAHOSTCXX} ${CMAKE_CUDA_HOST_COMPILER}) # The only thing honored by check_language(CUDA)!
endif()
include(CheckLanguage)
# Unfortunately check_language(CUDA) will only check whether there is
# a nvcc compiler. It will not check whether compilation with the above
# option works. Since the OPTIONAL flag of enable_language is currently
# ignored CMake will error out below if the options do not work.
check_language(CUDA)
if(CMAKE_CUDA_COMPILER)
# OPTIONAL is ignored. Hence the magic above to check whether enabling CUDA works
enable_language(CUDA OPTIONAL)
# While the documentation says that it is deprecated, FindCUDA seems the
# only easy way to determine the cublas and cusparse libraries.
# Hence we call it unconditionally
# The WellContributions kernel uses __shfl_down_sync, which was introduced in CUDA 9.0
find_package(CUDA)
endif()
# While the documentation says that it is deprecated, FindCUDA seems the
# only easy way to determine the cublas and cusparse libraries.
# Hence we call it unconditionally
# The WellContributions kernel uses __shfl_down_sync, which was introduced in CUDA 9.0
find_package(CUDA)
if(CUDA_FOUND AND CUDA_VERSION VERSION_LESS "9.0")
set(CUDA_FOUND OFF)
message(WARNING "Deactivating CUDA as we require version 9.0 or newer."